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[pureblood <1314213@xxxxxxxxxxxxxxxxxx>]

I have tried to install linux-image-3.15.0-031500rc3-generic following
this guide: http://linuxg.net/how-to-install-kernel-3-15-rc-3-on-ubuntu-
linux-mint-and-their-derivative-systems/ and I don't see the
"[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up" messages
anymore, however the stability issue persists. If I try to run xrandr
while the external DP monitor is in use, it either immediately reverts
to the laptop screen or it crashes the system. In the case it did not
crash the system, but rather reverted to the laptop screen, the
following output was found in dmesg:

[   92.883726] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training
[   92.890455] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization
[   92.921542] [drm:cpt_verify_modeset] *ERROR* mode set failed: pipe B stuck
[   92.985538] ------------[ cut here ]------------
[   92.985578] WARNING: CPU: 0 PID: 1371 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:9755 check_encoder_state+0x1fa/0x270 [i915]()
[   92.985579] encoder's hw state doesn't match sw tracking (expected 1, found 0)
[   92.985580] Modules linked in: pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm bnep bluetooth binfmt_misc joydev asix usbnet mii uvcvideo intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp videobuf2_vmalloc videobuf2_memops arc4 kvm_intel videobuf2_core videodev kvm iwldvm mac80211 snd_hda_codec_hdmi crct10dif_pclmul snd_hda_codec_conexant crc32_pclmul snd_hda_codec_generic ghash_clmulni_intel iwlwifi aesni_intel thinkpad_acpi aes_x86_64 snd_hda_intel lrw nvram snd_hda_controller gf128mul glue_helper ablk_helper snd_seq_midi cryptd snd_seq_midi_event snd_rawmidi snd_hda_codec cfg80211 snd_seq snd_hwdep snd_pcm psmouse mei_me serio_raw snd_seq_device mei lpc_ich snd_timer snd soundcore parport_pc mac_hid ppdev lp parport raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear hid_generic usbhid hid i915 e1000e ahci i2c_algo_bit sdhci_pci drm_kms_helper libahci sdhci ptp pps_core drm wmi video
[   92.985613] CPU: 0 PID: 1371 Comm: Xorg Tainted: G           OE 3.15.0-031500rc3-generic #201404280035
[   92.985614] Hardware name: LENOVO 42872WU/42872WU, BIOS 8DET64WW (1.34 ) 08/31/2012
[   92.985615]  000000000000261b ffff8801feefdb48 ffffffff81756ad4 0000000000000007
[   92.985617]  ffff8801feefdb98 ffff8801feefdb88 ffffffff8106b89c 00000304feefdb98
[   92.985619]  ffff88020f5d1000 ffff88020f728320 0000000000000000 ffff88020f728000
[   92.985620] Call Trace:
[   92.985626]  [<ffffffff81756ad4>] dump_stack+0x46/0x58
[   92.985628]  [<ffffffff8106b89c>] warn_slowpath_common+0x8c/0xc0
[   92.985630]  [<ffffffff8106b986>] warn_slowpath_fmt+0x46/0x50
[   92.985642]  [<ffffffffa0143f9a>] check_encoder_state+0x1fa/0x270 [i915]
[   92.985655]  [<ffffffffa0158d9d>] intel_modeset_check_state+0x5d/0xa0 [i915]
[   92.985667]  [<ffffffffa0158e05>] intel_set_mode+0x25/0x30 [i915]
[   92.985678]  [<ffffffffa01597a6>] intel_crtc_set_config+0x196/0x2f0 [i915]
[   92.985682]  [<ffffffff811b1bcc>] ? kmem_cache_alloc_trace+0x12c/0x160
[   92.985693]  [<ffffffffa002a080>] drm_mode_set_config_internal+0x60/0xf0 [drm]
[   92.985702]  [<ffffffffa002dcd0>] drm_mode_setcrtc+0x280/0x4e0 [drm]
[   92.985710]  [<ffffffffa0029312>] ? drm_modeset_unlock_all+0x52/0x60 [drm]
[   92.985717]  [<ffffffffa001ddab>] drm_ioctl+0x23b/0x530 [drm]
[   92.985726]  [<ffffffffa002da50>] ? drm_mode_setplane+0x3f0/0x3f0 [drm]
[   92.985729]  [<ffffffff810a3f8d>] ? vtime_account_user+0x5d/0x70
[   92.985732]  [<ffffffff811dec45>] do_vfs_ioctl+0x75/0x2c0
[   92.985735]  [<ffffffff81021e45>] ? syscall_trace_enter+0x165/0x280
[   92.985737]  [<ffffffff811e9145>] ? __fget_light+0x25/0x70
[   92.985739]  [<ffffffff811def21>] SyS_ioctl+0x91/0xb0
[   92.985741]  [<ffffffff8176cf3f>] tracesys+0xe1/0xe6
[   92.985743] ---[ end trace c770137b490c6c2e ]---
[   92.985771] [drm:intel_pipe_config_compare] *ERROR* mismatch in has_dp_encoder (expected 1, found 0)
[   92.985772] ------------[ cut here ]------------
[   92.985784] WARNING: CPU: 0 PID: 1371 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:9828 check_crtc_state+0x219/0x300 [i915]()
[   92.985785] pipe state doesn't match!
[   92.985785] Modules linked in: pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm bnep bluetooth binfmt_misc joydev asix usbnet mii uvcvideo intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp videobuf2_vmalloc videobuf2_memops arc4 kvm_intel videobuf2_core videodev kvm iwldvm mac80211 snd_hda_codec_hdmi crct10dif_pclmul snd_hda_codec_conexant crc32_pclmul snd_hda_codec_generic ghash_clmulni_intel iwlwifi aesni_intel thinkpad_acpi aes_x86_64 snd_hda_intel lrw nvram snd_hda_controller gf128mul glue_helper ablk_helper snd_seq_midi cryptd snd_seq_midi_event snd_rawmidi snd_hda_codec cfg80211 snd_seq snd_hwdep snd_pcm psmouse mei_me serio_raw snd_seq_device mei lpc_ich snd_timer snd soundcore parport_pc mac_hid ppdev lp parport raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear hid_generic usbhid hid i915 e1000e ahci i2c_algo_bit sdhci_pci drm_kms_helper libahci sdhci ptp pps_core drm wmi video
[   92.985812] CPU: 0 PID: 1371 Comm: Xorg Tainted: G        W  OE 3.15.0-031500rc3-generic #201404280035
[   92.985813] Hardware name: LENOVO 42872WU/42872WU, BIOS 8DET64WW (1.34 ) 08/31/2012
[   92.985814]  0000000000002664 ffff8801feefd8e8 ffffffff81756ad4 0000000000000007
[   92.985815]  ffff8801feefd938 ffff8801feefd928 ffffffff8106b89c ffff8801feefd958
[   92.985816]  ffff8800cd6bd000 ffff88020f728350 ffff88020f728000 ffff8800cd6bd6e0
[   92.985818] Call Trace:
[   92.985820]  [<ffffffff81756ad4>] dump_stack+0x46/0x58
[   92.985822]  [<ffffffff8106b89c>] warn_slowpath_common+0x8c/0xc0
[   92.985823]  [<ffffffff8106b986>] warn_slowpath_fmt+0x46/0x50
[   92.985835]  [<ffffffffa014b0e9>] check_crtc_state+0x219/0x300 [i915]
[   92.985847]  [<ffffffffa0158da5>] intel_modeset_check_state+0x65/0xa0 [i915]
[   92.985858]  [<ffffffffa0158e05>] intel_set_mode+0x25/0x30 [i915]
[   92.985869]  [<ffffffffa01597a6>] intel_crtc_set_config+0x196/0x2f0 [i915]
[   92.985871]  [<ffffffff811b1bcc>] ? kmem_cache_alloc_trace+0x12c/0x160
[   92.985880]  [<ffffffffa002a080>] drm_mode_set_config_internal+0x60/0xf0 [drm]
[   92.985889]  [<ffffffffa002dcd0>] drm_mode_setcrtc+0x280/0x4e0 [drm]
[   92.985896]  [<ffffffffa0029312>] ? drm_modeset_unlock_all+0x52/0x60 [drm]
[   92.985903]  [<ffffffffa001ddab>] drm_ioctl+0x23b/0x530 [drm]
[   92.985912]  [<ffffffffa002da50>] ? drm_mode_setplane+0x3f0/0x3f0 [drm]
[   92.985914]  [<ffffffff810a3f8d>] ? vtime_account_user+0x5d/0x70
[   92.985916]  [<ffffffff811dec45>] do_vfs_ioctl+0x75/0x2c0
[   92.985917]  [<ffffffff81021e45>] ? syscall_trace_enter+0x165/0x280
[   92.985919]  [<ffffffff811e9145>] ? __fget_light+0x25/0x70
[   92.985921]  [<ffffffff811def21>] SyS_ioctl+0x91/0xb0
[   92.985923]  [<ffffffff8176cf3f>] tracesys+0xe1/0xe6
[   92.985924] ---[ end trace c770137b490c6c2f ]---

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https://bugs.launchpad.net/bugs/1314213

Title:
  External DP1 monitor extremely unstable since upgrade to 14.04

Status in “linux” package in Ubuntu:
  New

Bug description:
  Since upgrade to 14.04, the external display on DP1 is extremely
  unstable. I get constant "[drm:intel_dp_i2c_aux_ch] *ERROR* too many
  retries, giving up" messages over dmesg. I used to get those with
  13.10, but there was no stability issue. Once the laptop (Lenovo X220)
  is connected to the monitor (resolution is 2560x1600), if I run any
  program like xrandr or unity-control-center, the system immediately
  reverts from the external display to the laptop display, and often
  crashes becoming unresponsive. Every time I run xrandr or unity-
  control-center, it triggers 20 "[drm:intel_dp_i2c_aux_ch] *ERROR* too
  many retries, giving up" messages in dmesg and if I am using the
  external monitor it further triggers a reproducible crash. It is
  possible that this might be related to the DVI->DP adapter I am using.
  Due to an unresolved bug, the correct EDID for the monitor is not
  recognized, and I have to manually add that after each boot.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  genovese   2538 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 29 10:00:31 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-01-21 (463 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 42872WU
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=1f880233-e827-4c00-b11a-2c7a4eb76497 ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (10 days ago)
  dmi.bios.date: 08/31/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET64WW (1.34 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 42872WU
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET64WW(1.34):bd08/31/2012:svnLENOVO:pn42872WU:pvrThinkPadX220:rvnLENOVO:rn42872WU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 42872WU
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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